PHOENIX — The Trump administration has ordered construction crews on a border wall to stop drilling wells in drought-stricken New Mexico after ranchers said pumping groundwater needed to make concrete could threaten their livestock. U.S. Customs and Border Protection, which oversees border wall construction, has said water is needed to make concrete for roads, wall construction and dust suppression. A spokesperson for CBP said on Monday that border wall contractors in New Mexico have been instructed to stop drilling new wells, but did not comment on whether the wells already drilled could be pumped. Before the first border wall went up, Johnson remembers seeing at least one truck of people crossing his ranch every week. As a former Border Patrol agent, he supports the border wall but doesn’t believe it should cost him his livelihood.